private bool OpenReferenceUrl(Reference reference, string name, string baseUrl)
        {
            ICssCompletionListEntry entry = reference.Invoke(name);
            if (entry != null)
            {
                string text = entry.DisplayText;
                Uri url;

                if (Uri.TryCreate(baseUrl + text, UriKind.Absolute, out url))
                {
                    System.Diagnostics.Process.Start(url.ToString());
                    return true;
                }
            }

            return false;
        }